FR-13. This nice natural arch is located on top of Roche Perfia (Perfia Rock) on the Aravis range in Haute-Savoie department of France. The opning is situated at 2487 meters in altitude near the ski area of La Clusaz. Note the Choucas bird flying through the span. IGN topographic map number 3430 east La Clusaz pleat D7. The arch is notified on the map but not spoted. Trou de la Mouche means Hole in the Fly.